• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2021.10a
• /
• pp.586-589
• /
• 2021

In this paper, Hyundai Motor Group's advanced cases and technologies are introduced in the mobility field through Boston Dynamics M&A, a new pivotal industrial robot technology that will lead the 21st century of Hyundai Motor Group, focusing on RT(Robot Technology) and related industries.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.17 no.7
• /
• pp.1602-1608
• /
• 2013

PoC (Push-to-Talk over Cellular) provides one-to-one as well as one-to-many communications with VoIP technology based on SIP over cellular networks. According to above property, PoC is considered as perscrptive technology for public protection for disaster relief networks. For this networks, group communication is the essential function. However, since current standardization process takes into general scenarios account without any consideration for mentioned networks, it have some problems in the point of adaptability. To solve above problem, in this paper, we propose how to reduce the overhead on the PoC server to reduce the transmission delay. Simulation results are shown to evaluate the improved performance.

• Journal of Broadcast Engineering
• /
• v.23 no.6
• /
• pp.790-799
• /
• 2018

UHD broadcasting based on ATSC 3.0 is being implemented in Korea, and discussion on mobile broadcasting based on ATSC 3.0 is underway. The ATSC 3.0 standard introduces internet protocol based standards in order to facilitate the implementation of conventional broadcasting services as well as broadcasting and communication convergence services interlocking with communication services. In this process, various requirements for the receiver have been derived, and factors to consider for developing the receiver product have also increased. ATSC 3.0 broadcasting is currently in the introduction stage of the service, and additional technology development and product implementation related to the receiver should proceed until the full-scale market is formed. In this regard, this paper describes the considerations for developing UHD receiver based on ATSC 3.0 and the test procedure for verifying developed receiver.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.10 no.9
• /
• pp.1565-1572
• /
• 2006

Recently with the ever increasing growth of data communication, the need for security and privacy has become a necessity. The advent of wireless communication and other handheld devices like Personal Digital Assistants and smart cards have made the implementation of cryptosystems a major issue. The Cellular Automata(CA) can be programmed to implement hardware sharing between the encryption and decryption. In this paper, we give conditions for a linear hybrid cellular automata with 60, 102 or 204 to be a linear hybrid group cellular automata C. And we present the conditions which the complemented hybrid group cellular automata C' with complement vectors derived from C has maximum equal lengths in the state transition diagram of C' Also we analyze the relationship among cycles of C' These results generalize Mukhopadhyay's results.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
• /
• v.11 no.6
• /
• pp.631-637
• /
• 2018

In 5G mobile communication, it is necessary to provide different mobility to user equipments(UE) that do not require mobility management or need limited mobility management. In this paper, we propose a two-layer mobility management system that classifies multiple MTC devices with similar mobility levels into c-MTC and m-MTC groups. In order to improve the energy efficiency and service life by reducing the number of control signals generated when TAU is performed, the group header typically performs a Tracking Area Update(TAU) request and adjusts the periodic TAU update period according to the mobility level. The TAU update period of the m-MTC is set to 54 minutes proposed by the 3GPP standard and the c-MTC is set to 12 minutes. Compared to when the UEs perform TAU individually, it is found that the number of control signals decreases by 33% when the MME is not changed and by 49% when the MME is not changed in the m-MTC or c-MTC group.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.12 no.1
• /
• pp.436-444
• /
• 2011

As practical use degree of multicasting increase, security for multicast is recognized as an important issue. Previous research in the area of secure multicast has mainly focused on group key management. The most important thing about the security of multicast is that only authorized members of this group will be able to access the data. The member of access to multicast communication is to use cryptography with a common shared session encryption key. We propose decentralized group key management based on agent for dynamic multicast with large groups and frequent joins or leaves in this paper. Whole group divide to several subgroup using agent technology and each agent manage members of each subgroup. Also, when rekeying updates that using one-way hash function can prevent the key exposure, and reduce the key distribution delay.

• Journal of the Korea Society of Computer and Information
• /
• v.6 no.1
• /
• pp.103-112
• /
• 2001

As electronic environment is changed owing to the developments of computers and telecommunication technique, the meaning of working process is changed because individual working process is shifted to overall working process of each groups while main frame is transferred to server environments. By using groupware, productivity of office work's is increased not only quality matter but also quantity matter and rapid and various services are provided. In order to realize united office automation, when educational programs are assembled at office automation related departments in junior colleges, it will help to stress importance of groupware.

• Proceedings of the Korean Information Science Society Conference
• /
• 2007.10d
• /
• pp.360-365
• /
• 2007

Jakarta Slide는 아파치 프로젝트 중의 하나로 개발된 WebDAV 서버로서 인터넷 통하여 다양한 콘텐츠의 비동기적인 협업 활동을 지원한다. 하지만 WebDAV 프로토콜은 사용자와 그룹을 위한 작업공간을 명시적으로 지원하지 않기 때문에, Jakarta Slide를 통하여 복잡한 협업을 수행하기는 매우 어렵다. CoSlide는 이러한 문제점을 개선하기 위하여 Jakarta Slide를 확장한 협업시스템으로서 다수의 사용자와 그룹을 위한 다양한 작업공간을 제공하여 효과적인 협업 환경을 제공한다. 협업시스템을 통하여 복잡한 협업을 보다 효과적으로 수행하기 위해서는 협업 참여자들 간에 실시간적인 통신이 원활이 이루어져야 할 필요성이 있다. 본 논문은 CoSlide 협업시스템에서 실시간 메시징을 지원하기 위한 CoJBother 메신저 클라이언트의 개발에 대하여 기술한다. 개발된 CoJBother는 협업시스템의 사용자와 그룹을 정의하기 위하여 개발된 Jabber 프로토콜을 사용하며, 또한 이를 지원하기 위하여 개발된 메신저 서버와 함께 동작한다. 사용자는 CoJBother를 통하여 협업시스템의 작업그룹에 참여하는 사용자들을 확인하고 자동적인 그룹채팅 기능을 사용함으로써 그룹 참여자들과 협업 수행을 위한 원활한 의사소통을 할 수 있다.

• Journal of KIISE:Information Networking
• /
• v.33 no.1
• /
• pp.9-15
• /
• 2006

While a lot of important information is being sent and received on the Internet, the information could be exposed to many threats, and the more the Multicast Service is various and generalized, the more the service range is widened. When a new member joins in or leaves from the Multicast Group, the Group Key, which the existing member use for, should be newly updated. The existing method had a problem that the performance was depreciated by the key exchanging. This paper proposes the effective group management mechanism for a secure transmission of the Multicast Data on the Multicast Group.

• Journal of KIISE:Information Networking
• /
• v.27 no.4
• /
• pp.489-497
• /
• 2000

주문형 비디오(Video On Demand)서버의 구현은 현재까지도 많은 부분에 한계를 가지고 있으며 이를 해결하기 위한 연구들이 활발히 진행되고 있다. 주문형 비디오 서비스의 한계는 대부분이 자원(디스크, 버퍼)의 제한 때문에 발생하고 있으며 디스크어레이(Disk Array)나, 메모리 뱅크(Memory Bank)와 같은 특수한 하드웨어를 사용하여 해결하고 있다. 또한 이와 아울러 그룹핑이나 버퍼 공유기법과 같은 소프트웨어적인 방법도 제안되었다. 본논문에서는 주분형 비디오 서버의 한계 중 디스크대역폭과 버퍼공간의 한계점에 의한 문제를 해결하기위하여 개선된 그룹핑 방법과 버퍼 공유 및 관리 방법을 제안한다. 제안하는 그룹핑 방법은 비디오의 인기도에 기반을 둔 방법을 사용하며 버퍼 공유방법은 버퍼의 크기 및 디스크의 대역폭 가용량에 따라 적응적으로 병합 분할하는 방법을 사용한다, 제안하는 병합 분할 방법은 피기백킹(piggy-backing)개념을 도입하였으며 시뮬레이션을 통해 제안하 방법의 우수성을 보였다.